<template>
  <div class='sub-sort'>
    <div class="sort">
      <a :class="{ active: sortParams.sortField === null }" @click="changeSort(null)" href="javascript:;">默认排序</a>
      <a :class="{ active: sortParams.sortField === 'publishTime' }" @click="changeSort('publishTime')"
        href="javascript:;">最新商品</a>
      <a :class="{ active: sortParams.sortField === 'orderNum' }" @click="changeSort('orderNum')"
        href="javascript:;">最高人气</a>
      <a :class="{ active: sortParams.sortField === 'evaluateNum' }" @click="changeSort('evaluateNum')"
        href="javascript:;">评论最多</a>
      <a @click="changeSort('price')" href="javascript:;">
        价格排序
        <i class="arrow up" :class="{ active: sortParams.sortField === 'price' && sortParams.sortMethod === 'asc' }" />
        <i class="arrow down" :class="{ active: sortParams.sortField === 'price' && sortParams.sortMethod === 'desc' }" />
      </a>
    </div>
    <div class="check">
      <XtxCheckbox @change="changeCheck" v-model="sortParams.inventory">仅显示有货商品</XtxCheckbox>
      <XtxCheckbox @change="changeCheck" v-model="sortParams.onlyDiscount">仅显示特惠商品</XtxCheckbox>
    </div>
  </div>
</template>
<script setup>
import { reactive } from 'vue'
// 1. 根据后台需要的参数定义数据对象
// 2. 根据数据对象，绑定组件（复选框，排序按钮）
// 3. 在操作排序组件的时候，需要反馈给数据对象
// sortField====>publishTime,orderNum,price,evaluateNum
// sortMethod====>asc为正序 desc为倒序
const sortParams = reactive({
  inventory: false,
  onlyDiscount: false,
  sortField: null,
  sortMethod: null
})
const emit = defineEmits(['sort-change'])
// 改变排序
const changeSort = (sortField) => {
  if (sortField === 'price') {
    sortParams.sortField = sortField
    if (sortParams.sortMethod === null) {
      // 第一次点击，默认是降序
      sortParams.sortMethod = 'desc'
    } else {
      // 其他情况根据当前排序取反
      sortParams.sortMethod = sortParams.sortMethod === 'desc' ? 'asc' : 'desc'
    }
  } else {
    // 如果排序未改变停止逻辑
    if (sortParams.sortField === sortField) return
    sortParams.sortField = sortField
    sortParams.sortMethod = null
  }
  emit('sort-change', sortParams)
}

const changeCheck = () => {
  emit('sort-change', sortParams)
}
</script>
<style scoped lang='less'>
.sub-sort {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;

  .sort {
    display: flex;

    a {
      height: 30px;
      line-height: 28px;
      border: 1px solid #e4e4e4;
      padding: 0 20px;
      margin-right: 20px;
      color: #999;
      border-radius: 2px;
      position: relative;
      transition: all .3s;

      &.active {
        background: @xtxColor;
        border-color: @xtxColor;
        color: #fff;
      }

      .arrow {
        position: absolute;
        border: 5px solid transparent;
        right: 8px;

        &.up {
          top: 3px;
          border-bottom-color: #bbb;

          &.active {
            border-bottom-color: @xtxColor;
          }
        }

        &.down {
          top: 15px;
          border-top-color: #bbb;

          &.active {
            border-top-color: @xtxColor;
          }
        }
      }
    }
  }

  .check {
    .xtx-checkbox {
      margin-left: 20px;
      color: #999;
    }
  }
}
</style>
